IRS penalty calculator
Estimate failure-to-file and failure-to-pay penalties under IRC § 6651, plus interest on unpaid tax.
- Failure to file
- 5% a month · up to 25%
- Failure to pay
- 0.5% a month · up to 25%
- Underpayment interest
- About 7.000000000000001% a year · no cap
Tax you owed but didn't pay by the deadline
$
Counting from the original due date
Your estimate
Enter the unpaid amount and how late it is to see an estimate.
Estimate only. Interest rates change quarterly. Doesn't account for IRS notices, penalty relief, payment plans or currently-not-collectible status. For advice on your situation, talk to a CPA, enrolled agent or tax attorney.